perfidious
American Heritage Dictionary:
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per·fid·i·ous
(pər-fĭd'ē-əs) 
adj.
Of, relating to, or marked by perfidy; treacherous. See synonyms at faithless.
perfidiously per·fid'i·ous·ly adv.
adj.
Of, relating to, or marked by perfidy; treacherous. See synonyms at faithless.
perfidiously per·fid'i·ous·ly adv.
Roget's Thesaurus:
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perfidious
adjective
- Not true to duty or obligation: disloyal, faithless, false, false-hearted, recreant, traitorous, treacherous, unfaithful, untrue. See continue/stop/pause, trust/distrust.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's Thesaurus
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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